Adaption circuit board for SOP56 & HSOP56 with 0.635 mm pitch. Epoxy fibre-glass FR4 1.50 mm. Double-sided 35 µm Cu. Plated through holes (PTH). Surface chem. Ni/Au. Solder stop mask. Hole spacing 2.54 mm. Hole diameter Ø 1.10 mm with solder pads Ø 2.20 m